Rock-drill.



W. H. LEONARD.

ROCK DRILL.

APPLICATION men MAY 1. I9H.

Patented Dec. 25, 1917.

.I M. u

UNITED STITATES PATENT OFFICE.

WILLIAM H. LEONARD, 0F DENVER, COLORADO, ASSIGNOB TO THE DENVER ROCK DBILL MANUFACTURING COMPANY, 01 DENVER, COLORADO, A CORPORATION OF DELAWARE.

ROCK-LDRILL Patented Dem 25, 1917.

Application filed May 1, 1914. Serial No. 835,632.

To all whom it may concern:

Be it known that I, WILLIAM H. Lnorisnn, a citizen of the United States, residing at Denver, in the county of Denver and btate of Colorado, have invented new and useful Improvements in Rock-Drills, of which the following is a specification.

The present invention relates to means for delivering cleansing fluid to the drill holes madeby rock drilling machines, and in its speeific.sense,.is part of the mechanism of a hammer drill. i

The object is to providenovel and sim 1e mechanism for insuring the discharge 0 a liquid cleansing agent into the bore of a drill bit and its conduction bysaid drill bit to the bottom of the drill hole, at the same time utilizing gaseous fluid, not only for the'purpose of assisting in the cleansing action, but for directing the liquid into the drill bit and preventing ts entrance into, and possibly flooding the motor.

A simple embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a. view in elevation and some-- what diagrammatic in its character of a hanimer drill, with portions broken away and the novel structure illustrated in section.

Fig. 2 is a detail cross sectional view through the tubes or conduits on the line 2-2 ofFig. 1.

Similar reference numerals designate corresponding parts in all the figures of the drawings.

In the embodiment illustrated, the motor of the drill, as usual. consists of a cylinder member 3 having a front head 4 and a rear head, which in the embodiment illustrated, consists of sections 5 and 6. In the cylinder member operates a reciprocatory hammer piston 7, which on its Working stroke, strikes atappet 8 located in the front end of the cylinder member 3. said tappct being interposed between the piston T and the rear end of the removable drill bit 8. This drill bit, as usual, is provided with a longitudinal bore 9 opening through both ends. The operation of the piston 7 is controlled by an automatic distributing valve located in a valve chest 9. As these are well known features, it is believed'to be unnecessary to further describe the same. Furthermore. it will be evident that they may be modified in various ways.

, opening through the rear face of the same,

said pocln-rtv being centrally disposed. A tube 14 has its rear end located in the pocket,

and said tube extends forwardly through the piston 7 and into the bore" 10 of the tappt,f terminating short of the reduced portion 11 c of said bore. The rear end'of the tube is surrounded by a packin 15, preferably of rubber, which is crowde by means of a gland 16 slidably mounted in theirear end of the pocket 13. Gaseous fluid, under pressure, is supplied to the rear end of the tube 14 through a passageway 17 leading from the valve chest 9, said passageway being formed in the section 5 and in the gland 16, the passageway communicating With the rear end of the tube. Thus, the said fluid will discharge into the bore 10 of the tappet 8, and through said bore, into the bore 9 of the drill bit.

Another and smaller tube 18 is disposed longitudinally Within the tube 14 in spaced relation to the walls thereof. This tube has its rear end extending through the gland 16,

and into pocket 19 formed in the outer section 6 of the rear cylinder head. Packing 20, in the fornr of rubber, is interposed between the rear wall of the pocket 19 and the gland 16. Thus, said packing is crowded against and around the rear end of the tube 18 to prevent leakage and also to hold said tube in place. It will thus be seen that by clamping the head sections (3 and 5 together, ivhich is ordinarily done. by the side bolts of the motor (not shown the rear end of the tubes will be effectively secured in place. The section 6 of the rear cylinder head is provided with an internally threaded socket 21 to receive a hose coupling, by which liquid can be supplied to the motor. from any suitable source. and this socket 21 has communication with the rear end of the tube 18, through a port The front end of the tube 18 projects beyond the front end of the tube 14, into the reduced portion 11 of'the bore of the tappet, said front end being preferubly tapered, and being spaced from the walls of the bore 10-11, the tube 18, hon.

against said tube ever, terminating short of the drill bit 3*. In order to maintain the front end of sald tube 18 in its axial relatiomone ofsaid tubes,

for example, the outer one, is provided with offset spaced lugs 23, which engage the tube 18 and center the same.

, Briefly described,-the operation of the de- ',vice is substantially as follows :-\Vhen the motor is in operation, with a drill bit therein, air or other gaseous fluid flows from the valve che t 9 through the passageway 17, into the outer tube 14. and discharges from the front end of said tube around the. tube 1 18: It is delivered from the tappet intothe into the rear end of the drill bit.

bore of the drill bit, and traversing said drill bit, discharges from the front end of the same into the bottom of the drill hole, blowing out the cuttings. Whenever water or liquid is admitted through the nipple 21 and pamageway 22 into the rear end of the tube 18, said liquid will pass through'the tube and be discharged from its front end \Vhen' so discharged, it is surrounded by the tubular column of air, discharging from the front end of the tube 14, and this confines the stream of liquid, insuring that it will cross the joint between the tappet and the drill Kit and discharge into the bore of said drill it. There is therefore practically no leakage of the liquid into the machine.

The termination of the tube short of the drill bit 8' is important for the reason that when the tube is extended into the drill bit, it is apt to be cut oil by burs formed upon the rear end of the bit, due to the continued hammering action thereagainst. If,- however, the tube is thus terminated there is danger of leakage around the joint behind the drill bit. The tubular column'of air, as

i above described, confines the stream of li uid as it crosses the joint, and it is there ore important that this tubular air column be maintained. For these reasons. the utilization of means such as the parts 23 for maintaining the inner tubes centered with respect to the outer tube is important, for if the tube is supported merely at its rear end, its front-end is apt to become displaced from the desired axial disposition, it being remembered that the tool is subjected to continuous shocks and vibrations incident to the operation thereof. The present centering means therefore is important in connection with the disposition of the discharge ends of the tubes.

.lFlOlll the foregoing, it is thought that the cons? ruction. operation and many advantages ot',tlae herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that. various changes in the size, shape, proportion. and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention. For example, other means may be employed for securing the rear ends of the tubes, and a difl erent connection for the water supply may be employed.

Having thus fully described my invention, .what I claim as new, and desire to secure by Letters Patent, is 2-- 1. In apparatus of the character set forth, the combination with. a pistolifo'r' operating on a'drill bit, of means passing through the piston for introducing a-liquid cleansing agent into the drill bit operated on b 'the piston, means adjacent to such drill blb fOl supporting said introducing means against lateral displacement with respect to the drill bit, means also passing through the piston and terminating short of the drill bit-for introducing a gaseous cleansing agent into' the drill bit, and means adjacent to such drill bit for maintaining said latter meansagainst lateral displacement.

2. In apparatus of the character set forth, the combination with a piston for operating on a drill bit, of a plurality of conduits extending'through the piston fordelivering to the bore of said drill bit, means for supplying a liquid cleansing agentto one. con-f duit and a gaseous cleansin cleansing agent having its-'- disch'ar ge agent one i other conduit, the conduit, oi: the gaseous;

terminating short of the drill bit, and means adjacent the'discharge ends ofsaidconduits for preventing the. lateral displacement of both with respect to the drill bit operated upon,

3. In apparatus of the character 'set forth, the combination with a piston for operating on a drill bit, of a plurality of conduits located (me within the other, the outer conduit having its discharge end terminating short of such-drill bit, said conduits extending through the piston for delivering to the bore of the drill bit operated on, means for supplying a liquid cleansing agent to one conduit and a gaseous cleansing agent to the other conduit, means for supporting the discharge end of the outer .conduit against lateral displacement with respect to the drill bit, and means interposed between the conduits for holding them in spaced relation and preventing the lateral displacement of the inner conduit.

4.. In apparatus of the character set forth, the combination with a reciprocatory piston for operating on a. drill bit, of axially disposed conduits extending axially through the piston and discharging into the bore of the drill bit operated upon, means for supplying a liquid cleansing agent to the inner conduit, and a gaseous cleansing agent to the outer conduit, said outer conduit having its discharge end terminating short of the drill bit. means for supporting the discharge and of the outer conduit against lateral displacement with respect to the bore of the posed between the free end drill bit operated upon, and means interortions of the conduits for maintaining t em inspaced relation andthereby' securing the inner condu it lateral displecement with re-l to the outer-conduit end the bore of drill bit operated'upon.

5. In apparatus the character set forth,

the combination w th a drill bit having a bore, of a reci roc'atory iston for operating on the drill 1 cylin er member-containing the pistdh and having a rear head,

cleansing fluid conducting tubes extending from the .rear head through the piston and delivering to the drill bit, a packing member 'fore'ach-tube in the rear head, and a mom able gland interposed between the packing members. A

6. In apparatus of the character set forth,

the combination with a drill bit having a bore of a reciprocatory iston for operating on the drill bit, a cilin er member containin the piston and aving a rear head, axia1 y disposed conduits extending from the rear head through the including a port located in t e gland.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- WILLIAM H LEONARD. Witnesses: k

W. Wnwron,

A. 'A. SnLLEox.

nesses. 

